| 1 | /* Copyright (C) 1995, 1996, 1997, 1999, 2000, 2001, 2003, 2004, 2006, |
| 2 | * 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc. |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public License |
| 6 | * as published by the Free Software Foundation; either version 3 of |
| 7 | * the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with this library; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 17 | * 02110-1301 USA |
| 18 | */ |
| 19 | |
| 20 | |
| 21 | \f |
| 22 | |
| 23 | #ifdef HAVE_CONFIG_H |
| 24 | # include <config.h> |
| 25 | #endif |
| 26 | |
| 27 | #include <stdio.h> |
| 28 | #include <ctype.h> |
| 29 | #include <string.h> |
| 30 | #include <unistd.h> |
| 31 | #include <unicase.h> |
| 32 | #include <unictype.h> |
| 33 | |
| 34 | #include "libguile/_scm.h" |
| 35 | #include "libguile/bytevectors.h" |
| 36 | #include "libguile/chars.h" |
| 37 | #include "libguile/eval.h" |
| 38 | #include "libguile/arrays.h" |
| 39 | #include "libguile/bitvectors.h" |
| 40 | #include "libguile/keywords.h" |
| 41 | #include "libguile/alist.h" |
| 42 | #include "libguile/srcprop.h" |
| 43 | #include "libguile/hashtab.h" |
| 44 | #include "libguile/hash.h" |
| 45 | #include "libguile/ports.h" |
| 46 | #include "libguile/fports.h" |
| 47 | #include "libguile/root.h" |
| 48 | #include "libguile/strings.h" |
| 49 | #include "libguile/strports.h" |
| 50 | #include "libguile/vectors.h" |
| 51 | #include "libguile/validate.h" |
| 52 | #include "libguile/srfi-4.h" |
| 53 | #include "libguile/srfi-13.h" |
| 54 | |
| 55 | #include "libguile/read.h" |
| 56 | #include "libguile/private-options.h" |
| 57 | |
| 58 | |
| 59 | \f |
| 60 | |
| 61 | SCM_GLOBAL_SYMBOL (scm_sym_dot, "."); |
| 62 | SCM_SYMBOL (scm_keyword_prefix, "prefix"); |
| 63 | SCM_SYMBOL (scm_keyword_postfix, "postfix"); |
| 64 | SCM_SYMBOL (sym_nil, "nil"); |
| 65 | |
| 66 | /* SRFI-105 curly infix expression support */ |
| 67 | SCM_SYMBOL (sym_nfx, "$nfx$"); |
| 68 | SCM_SYMBOL (sym_bracket_list, "$bracket-list$"); |
| 69 | SCM_SYMBOL (sym_bracket_apply, "$bracket-apply$"); |
| 70 | |
| 71 | scm_t_option scm_read_opts[] = |
| 72 | { |
| 73 | { SCM_OPTION_BOOLEAN, "copy", 0, |
| 74 | "Copy source code expressions." }, |
| 75 | { SCM_OPTION_BOOLEAN, "positions", 1, |
| 76 | "Record positions of source code expressions." }, |
| 77 | { SCM_OPTION_BOOLEAN, "case-insensitive", 0, |
| 78 | "Convert symbols to lower case."}, |
| 79 | { SCM_OPTION_SCM, "keywords", (scm_t_bits) SCM_BOOL_F_BITS, |
| 80 | "Style of keyword recognition: #f, 'prefix or 'postfix."}, |
| 81 | { SCM_OPTION_BOOLEAN, "r6rs-hex-escapes", 0, |
| 82 | "Use R6RS variable-length character and string hex escapes."}, |
| 83 | { SCM_OPTION_BOOLEAN, "square-brackets", 1, |
| 84 | "Treat `[' and `]' as parentheses, for R6RS compatibility."}, |
| 85 | { SCM_OPTION_BOOLEAN, "hungry-eol-escapes", 0, |
| 86 | "In strings, consume leading whitespace after an escaped end-of-line."}, |
| 87 | { SCM_OPTION_BOOLEAN, "curly-infix", 0, |
| 88 | "Support SRFI-105 curly infix expressions."}, |
| 89 | { 0, }, |
| 90 | }; |
| 91 | |
| 92 | /* Internal read options structure. This is initialized by 'scm_read' |
| 93 | from the global and per-port read options, and a pointer is passed |
| 94 | down to all helper functions. */ |
| 95 | |
| 96 | enum t_keyword_style |
| 97 | { |
| 98 | KEYWORD_STYLE_HASH_PREFIX, |
| 99 | KEYWORD_STYLE_PREFIX, |
| 100 | KEYWORD_STYLE_POSTFIX |
| 101 | }; |
| 102 | |
| 103 | struct t_read_opts |
| 104 | { |
| 105 | enum t_keyword_style keyword_style; |
| 106 | unsigned int copy_source_p : 1; |
| 107 | unsigned int record_positions_p : 1; |
| 108 | unsigned int case_insensitive_p : 1; |
| 109 | unsigned int r6rs_escapes_p : 1; |
| 110 | unsigned int square_brackets_p : 1; |
| 111 | unsigned int hungry_eol_escapes_p : 1; |
| 112 | unsigned int curly_infix_p : 1; |
| 113 | unsigned int neoteric_p : 1; |
| 114 | }; |
| 115 | |
| 116 | typedef struct t_read_opts scm_t_read_opts; |
| 117 | |
| 118 | |
| 119 | /* |
| 120 | Give meaningful error messages for errors |
| 121 | |
| 122 | We use the format |
| 123 | |
| 124 | FILE:LINE:COL: MESSAGE |
| 125 | This happened in .... |
| 126 | |
| 127 | This is not standard GNU format, but the test-suite likes the real |
| 128 | message to be in front. |
| 129 | |
| 130 | */ |
| 131 | |
| 132 | |
| 133 | void |
| 134 | scm_i_input_error (char const *function, |
| 135 | SCM port, const char *message, SCM arg) |
| 136 | { |
| 137 | SCM fn = (scm_is_string (SCM_FILENAME(port)) |
| 138 | ? SCM_FILENAME(port) |
| 139 | : scm_from_locale_string ("#<unknown port>")); |
| 140 | |
| 141 | SCM string_port = scm_open_output_string (); |
| 142 | SCM string = SCM_EOL; |
| 143 | scm_simple_format (string_port, |
| 144 | scm_from_locale_string ("~A:~S:~S: ~A"), |
| 145 | scm_list_4 (fn, |
| 146 | scm_from_long (SCM_LINUM (port) + 1), |
| 147 | scm_from_int (SCM_COL (port) + 1), |
| 148 | scm_from_locale_string (message))); |
| 149 | |
| 150 | string = scm_get_output_string (string_port); |
| 151 | scm_close_output_port (string_port); |
| 152 | scm_error_scm (scm_from_latin1_symbol ("read-error"), |
| 153 | function? scm_from_locale_string (function) : SCM_BOOL_F, |
| 154 | string, |
| 155 | arg, |
| 156 | SCM_BOOL_F); |
| 157 | } |
| 158 | |
| 159 | |
| 160 | SCM_DEFINE (scm_read_options, "read-options-interface", 0, 1, 0, |
| 161 | (SCM setting), |
| 162 | "Option interface for the read options. Instead of using\n" |
| 163 | "this procedure directly, use the procedures @code{read-enable},\n" |
| 164 | "@code{read-disable}, @code{read-set!} and @code{read-options}.") |
| 165 | #define FUNC_NAME s_scm_read_options |
| 166 | { |
| 167 | SCM ans = scm_options (setting, |
| 168 | scm_read_opts, |
| 169 | FUNC_NAME); |
| 170 | if (SCM_COPY_SOURCE_P) |
| 171 | SCM_RECORD_POSITIONS_P = 1; |
| 172 | return ans; |
| 173 | } |
| 174 | #undef FUNC_NAME |
| 175 | |
| 176 | /* A fluid referring to an association list mapping extra hash |
| 177 | characters to procedures. */ |
| 178 | static SCM *scm_i_read_hash_procedures; |
| 179 | |
| 180 | static SCM |
| 181 | scm_i_read_hash_procedures_ref (void) |
| 182 | { |
| 183 | return scm_fluid_ref (*scm_i_read_hash_procedures); |
| 184 | } |
| 185 | |
| 186 | static void |
| 187 | scm_i_read_hash_procedures_set_x (SCM value) |
| 188 | { |
| 189 | scm_fluid_set_x (*scm_i_read_hash_procedures, value); |
| 190 | } |
| 191 | |
| 192 | \f |
| 193 | /* Token readers. */ |
| 194 | |
| 195 | |
| 196 | /* Size of the C buffer used to read symbols and numbers. */ |
| 197 | #define READER_BUFFER_SIZE 128 |
| 198 | |
| 199 | /* Number of 32-bit codepoints in the buffer used to read strings. */ |
| 200 | #define READER_STRING_BUFFER_SIZE 128 |
| 201 | |
| 202 | /* The maximum size of Scheme character names. */ |
| 203 | #define READER_CHAR_NAME_MAX_SIZE 50 |
| 204 | |
| 205 | /* The maximum size of reader directive names. */ |
| 206 | #define READER_DIRECTIVE_NAME_MAX_SIZE 50 |
| 207 | |
| 208 | |
| 209 | /* `isblank' is only in C99. */ |
| 210 | #define CHAR_IS_BLANK_(_chr) \ |
| 211 | (((_chr) == ' ') || ((_chr) == '\t') || ((_chr) == '\n') \ |
| 212 | || ((_chr) == '\f') || ((_chr) == '\r')) |
| 213 | |
| 214 | #ifdef MSDOS |
| 215 | # define CHAR_IS_BLANK(_chr) \ |
| 216 | ((CHAR_IS_BLANK_ (chr)) || ((_chr) == 26)) |
| 217 | #else |
| 218 | # define CHAR_IS_BLANK CHAR_IS_BLANK_ |
| 219 | #endif |
| 220 | |
| 221 | |
| 222 | /* R5RS one-character delimiters (see section 7.1.1, ``Lexical |
| 223 | structure''). */ |
| 224 | #define CHAR_IS_R5RS_DELIMITER(c) \ |
| 225 | (CHAR_IS_BLANK (c) \ |
| 226 | || (c) == ')' || (c) == '(' || (c) == ';' || (c) == '"') |
| 227 | |
| 228 | #define CHAR_IS_DELIMITER(c) \ |
| 229 | (CHAR_IS_R5RS_DELIMITER (c) \ |
| 230 | || (((c) == ']' || (c) == '[') && (opts->square_brackets_p \ |
| 231 | || opts->curly_infix_p)) \ |
| 232 | || (((c) == '}' || (c) == '{') && opts->curly_infix_p)) |
| 233 | |
| 234 | /* Exponent markers, as defined in section 7.1.1 of R5RS, ``Lexical |
| 235 | Structure''. */ |
| 236 | #define CHAR_IS_EXPONENT_MARKER(_chr) \ |
| 237 | (((_chr) == 'e') || ((_chr) == 's') || ((_chr) == 'f') \ |
| 238 | || ((_chr) == 'd') || ((_chr) == 'l')) |
| 239 | |
| 240 | /* Read an SCSH block comment. */ |
| 241 | static SCM scm_read_scsh_block_comment (scm_t_wchar, SCM); |
| 242 | static SCM scm_read_r6rs_block_comment (scm_t_wchar, SCM); |
| 243 | static SCM scm_read_commented_expression (scm_t_wchar, SCM, scm_t_read_opts *); |
| 244 | static SCM scm_read_shebang (scm_t_wchar, SCM, scm_t_read_opts *); |
| 245 | static SCM scm_get_hash_procedure (int); |
| 246 | |
| 247 | /* Read from PORT until a delimiter (e.g., a whitespace) is read. Put the |
| 248 | result in the pre-allocated buffer BUF. Return zero if the whole token has |
| 249 | fewer than BUF_SIZE bytes, non-zero otherwise. READ will be set the number of |
| 250 | bytes actually read. */ |
| 251 | static int |
| 252 | read_token (SCM port, scm_t_read_opts *opts, |
| 253 | char *buf, size_t buf_size, size_t *read) |
| 254 | { |
| 255 | *read = 0; |
| 256 | |
| 257 | while (*read < buf_size) |
| 258 | { |
| 259 | int chr; |
| 260 | |
| 261 | chr = scm_get_byte_or_eof (port); |
| 262 | |
| 263 | if (chr == EOF) |
| 264 | return 0; |
| 265 | else if (CHAR_IS_DELIMITER (chr)) |
| 266 | { |
| 267 | scm_unget_byte (chr, port); |
| 268 | return 0; |
| 269 | } |
| 270 | else |
| 271 | { |
| 272 | *buf = (char) chr; |
| 273 | buf++, (*read)++; |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | return 1; |
| 278 | } |
| 279 | |
| 280 | /* Like `read_token', but return either BUFFER, or a GC-allocated buffer |
| 281 | if the token doesn't fit in BUFFER_SIZE bytes. */ |
| 282 | static char * |
| 283 | read_complete_token (SCM port, scm_t_read_opts *opts, |
| 284 | char *buffer, size_t buffer_size, size_t *read) |
| 285 | { |
| 286 | int overflow = 0; |
| 287 | size_t bytes_read, overflow_size = 0; |
| 288 | char *overflow_buffer = NULL; |
| 289 | |
| 290 | do |
| 291 | { |
| 292 | overflow = read_token (port, opts, buffer, buffer_size, &bytes_read); |
| 293 | if (bytes_read == 0) |
| 294 | break; |
| 295 | if (overflow || overflow_size != 0) |
| 296 | { |
| 297 | if (overflow_size == 0) |
| 298 | { |
| 299 | overflow_buffer = scm_gc_malloc_pointerless (bytes_read, "read"); |
| 300 | memcpy (overflow_buffer, buffer, bytes_read); |
| 301 | overflow_size = bytes_read; |
| 302 | } |
| 303 | else |
| 304 | { |
| 305 | char *new_buf = |
| 306 | scm_gc_malloc_pointerless (overflow_size + bytes_read, "read"); |
| 307 | |
| 308 | memcpy (new_buf, overflow_buffer, overflow_size); |
| 309 | memcpy (new_buf + overflow_size, buffer, bytes_read); |
| 310 | |
| 311 | overflow_buffer = new_buf; |
| 312 | overflow_size += bytes_read; |
| 313 | } |
| 314 | } |
| 315 | } |
| 316 | while (overflow); |
| 317 | |
| 318 | if (overflow_size) |
| 319 | *read = overflow_size; |
| 320 | else |
| 321 | *read = bytes_read; |
| 322 | |
| 323 | return (overflow_size > 0 ? overflow_buffer : buffer); |
| 324 | } |
| 325 | |
| 326 | /* Skip whitespace from PORT and return the first non-whitespace character |
| 327 | read. Raise an error on end-of-file. */ |
| 328 | static int |
| 329 | flush_ws (SCM port, scm_t_read_opts *opts, const char *eoferr) |
| 330 | { |
| 331 | scm_t_wchar c; |
| 332 | while (1) |
| 333 | switch (c = scm_getc (port)) |
| 334 | { |
| 335 | case EOF: |
| 336 | goteof: |
| 337 | if (eoferr) |
| 338 | { |
| 339 | scm_i_input_error (eoferr, |
| 340 | port, |
| 341 | "end of file", |
| 342 | SCM_EOL); |
| 343 | } |
| 344 | return c; |
| 345 | |
| 346 | case ';': |
| 347 | lp: |
| 348 | switch (c = scm_getc (port)) |
| 349 | { |
| 350 | case EOF: |
| 351 | goto goteof; |
| 352 | default: |
| 353 | goto lp; |
| 354 | case SCM_LINE_INCREMENTORS: |
| 355 | break; |
| 356 | } |
| 357 | break; |
| 358 | |
| 359 | case '#': |
| 360 | switch (c = scm_getc (port)) |
| 361 | { |
| 362 | case EOF: |
| 363 | eoferr = "read_sharp"; |
| 364 | goto goteof; |
| 365 | case '!': |
| 366 | scm_read_shebang (c, port, opts); |
| 367 | break; |
| 368 | case ';': |
| 369 | scm_read_commented_expression (c, port, opts); |
| 370 | break; |
| 371 | case '|': |
| 372 | if (scm_is_false (scm_get_hash_procedure (c))) |
| 373 | { |
| 374 | scm_read_r6rs_block_comment (c, port); |
| 375 | break; |
| 376 | } |
| 377 | /* fall through */ |
| 378 | default: |
| 379 | scm_ungetc (c, port); |
| 380 | return '#'; |
| 381 | } |
| 382 | break; |
| 383 | |
| 384 | case SCM_LINE_INCREMENTORS: |
| 385 | case SCM_SINGLE_SPACES: |
| 386 | case '\t': |
| 387 | break; |
| 388 | |
| 389 | default: |
| 390 | return c; |
| 391 | } |
| 392 | |
| 393 | return 0; |
| 394 | } |
| 395 | |
| 396 | |
| 397 | \f |
| 398 | /* Token readers. */ |
| 399 | |
| 400 | static SCM scm_read_expression (SCM port, scm_t_read_opts *opts); |
| 401 | static SCM scm_read_sharp (int chr, SCM port, scm_t_read_opts *opts, |
| 402 | long line, int column); |
| 403 | |
| 404 | |
| 405 | static SCM |
| 406 | maybe_annotate_source (SCM x, SCM port, scm_t_read_opts *opts, |
| 407 | long line, int column) |
| 408 | { |
| 409 | if (opts->record_positions_p) |
| 410 | scm_i_set_source_properties_x (x, line, column, SCM_FILENAME (port)); |
| 411 | return x; |
| 412 | } |
| 413 | |
| 414 | static SCM |
| 415 | scm_read_sexp (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
| 416 | #define FUNC_NAME "scm_i_lreadparen" |
| 417 | { |
| 418 | int c; |
| 419 | SCM tmp, tl, ans = SCM_EOL; |
| 420 | const int curly_list_p = (chr == '{') && opts->curly_infix_p; |
| 421 | const int terminating_char = ((chr == '{') ? '}' |
| 422 | : ((chr == '[') ? ']' |
| 423 | : ')')); |
| 424 | |
| 425 | /* Need to capture line and column numbers here. */ |
| 426 | long line = SCM_LINUM (port); |
| 427 | int column = SCM_COL (port) - 1; |
| 428 | |
| 429 | c = flush_ws (port, opts, FUNC_NAME); |
| 430 | if (terminating_char == c) |
| 431 | return SCM_EOL; |
| 432 | |
| 433 | scm_ungetc (c, port); |
| 434 | tmp = scm_read_expression (port, opts); |
| 435 | |
| 436 | /* Note that it is possible for scm_read_expression to return |
| 437 | scm_sym_dot, but not as part of a dotted pair: as in #{.}#. So |
| 438 | check that it's a real dot by checking `c'. */ |
| 439 | if (c == '.' && scm_is_eq (scm_sym_dot, tmp)) |
| 440 | { |
| 441 | ans = scm_read_expression (port, opts); |
| 442 | if (terminating_char != (c = flush_ws (port, opts, FUNC_NAME))) |
| 443 | scm_i_input_error (FUNC_NAME, port, "missing close paren", |
| 444 | SCM_EOL); |
| 445 | return ans; |
| 446 | } |
| 447 | |
| 448 | /* Build the head of the list structure. */ |
| 449 | ans = tl = scm_cons (tmp, SCM_EOL); |
| 450 | |
| 451 | while (terminating_char != (c = flush_ws (port, opts, FUNC_NAME))) |
| 452 | { |
| 453 | SCM new_tail; |
| 454 | |
| 455 | if (c == ')' || (c == ']' && opts->square_brackets_p) |
| 456 | || ((c == '}' || c == ']') && opts->curly_infix_p)) |
| 457 | scm_i_input_error (FUNC_NAME, port, |
| 458 | "in pair: mismatched close paren: ~A", |
| 459 | scm_list_1 (SCM_MAKE_CHAR (c))); |
| 460 | |
| 461 | scm_ungetc (c, port); |
| 462 | tmp = scm_read_expression (port, opts); |
| 463 | |
| 464 | /* See above note about scm_sym_dot. */ |
| 465 | if (c == '.' && scm_is_eq (scm_sym_dot, tmp)) |
| 466 | { |
| 467 | SCM_SETCDR (tl, scm_read_expression (port, opts)); |
| 468 | |
| 469 | c = flush_ws (port, opts, FUNC_NAME); |
| 470 | if (terminating_char != c) |
| 471 | scm_i_input_error (FUNC_NAME, port, |
| 472 | "in pair: missing close paren", SCM_EOL); |
| 473 | break; |
| 474 | } |
| 475 | |
| 476 | new_tail = scm_cons (tmp, SCM_EOL); |
| 477 | SCM_SETCDR (tl, new_tail); |
| 478 | tl = new_tail; |
| 479 | } |
| 480 | |
| 481 | if (curly_list_p) |
| 482 | { |
| 483 | /* In addition to finding the length, 'scm_ilength' checks for |
| 484 | improper or circular lists, in which case it returns -1. */ |
| 485 | int len = scm_ilength (ans); |
| 486 | |
| 487 | /* The (len == 0) case is handled above */ |
| 488 | if (len == 1) |
| 489 | /* Return directly to avoid re-annotating the element's source |
| 490 | location with the position of the outer brace. Also, it |
| 491 | might not be possible to annotate the element. */ |
| 492 | return scm_car (ans); /* {e} => e */ |
| 493 | else if (len == 2) |
| 494 | ; /* Leave the list unchanged: {e1 e2} => (e1 e2) */ |
| 495 | else if (len >= 3 && (len & 1)) |
| 496 | { |
| 497 | /* It's a proper list whose length is odd and at least 3. If |
| 498 | the elements at odd indices (the infix operator positions) |
| 499 | are all 'equal?', then it's a simple curly-infix list. |
| 500 | Otherwise it's a mixed curly-infix list. */ |
| 501 | SCM op = scm_cadr (ans); |
| 502 | |
| 503 | /* Check to see if the elements at odd indices are 'equal?' */ |
| 504 | for (tl = scm_cdddr (ans); ; tl = scm_cddr (tl)) |
| 505 | { |
| 506 | if (scm_is_null (tl)) |
| 507 | { |
| 508 | /* Convert simple curly-infix list to prefix: |
| 509 | {a <op> b <op> ...} => (<op> a b ...) */ |
| 510 | tl = ans; |
| 511 | while (scm_is_pair (scm_cdr (tl))) |
| 512 | { |
| 513 | tmp = scm_cddr (tl); |
| 514 | SCM_SETCDR (tl, tmp); |
| 515 | tl = tmp; |
| 516 | } |
| 517 | ans = scm_cons (op, ans); |
| 518 | break; |
| 519 | } |
| 520 | else if (scm_is_false (scm_equal_p (op, scm_car (tl)))) |
| 521 | { |
| 522 | /* Mixed curly-infix list: {e ...} => ($nfx$ e ...) */ |
| 523 | ans = scm_cons (sym_nfx, ans); |
| 524 | break; |
| 525 | } |
| 526 | } |
| 527 | } |
| 528 | else |
| 529 | /* Mixed curly-infix (possibly improper) list: |
| 530 | {e . tail} => ($nfx$ e . tail) */ |
| 531 | ans = scm_cons (sym_nfx, ans); |
| 532 | } |
| 533 | |
| 534 | return maybe_annotate_source (ans, port, opts, line, column); |
| 535 | } |
| 536 | #undef FUNC_NAME |
| 537 | |
| 538 | |
| 539 | /* Read a hexadecimal number NDIGITS in length. Put its value into the variable |
| 540 | C. If TERMINATOR is non-null, terminate early if the TERMINATOR character is |
| 541 | found. */ |
| 542 | #define SCM_READ_HEX_ESCAPE(ndigits, terminator) \ |
| 543 | do \ |
| 544 | { \ |
| 545 | scm_t_wchar a; \ |
| 546 | size_t i = 0; \ |
| 547 | c = 0; \ |
| 548 | while (i < ndigits) \ |
| 549 | { \ |
| 550 | a = scm_getc (port); \ |
| 551 | if (a == EOF) \ |
| 552 | goto str_eof; \ |
| 553 | if (terminator \ |
| 554 | && (a == (scm_t_wchar) terminator) \ |
| 555 | && (i > 0)) \ |
| 556 | break; \ |
| 557 | if ('0' <= a && a <= '9') \ |
| 558 | a -= '0'; \ |
| 559 | else if ('A' <= a && a <= 'F') \ |
| 560 | a = a - 'A' + 10; \ |
| 561 | else if ('a' <= a && a <= 'f') \ |
| 562 | a = a - 'a' + 10; \ |
| 563 | else \ |
| 564 | { \ |
| 565 | c = a; \ |
| 566 | goto bad_escaped; \ |
| 567 | } \ |
| 568 | c = c * 16 + a; \ |
| 569 | i ++; \ |
| 570 | } \ |
| 571 | } while (0) |
| 572 | |
| 573 | static void |
| 574 | skip_intraline_whitespace (SCM port) |
| 575 | { |
| 576 | scm_t_wchar c; |
| 577 | |
| 578 | do |
| 579 | { |
| 580 | c = scm_getc (port); |
| 581 | if (c == EOF) |
| 582 | return; |
| 583 | } |
| 584 | while (c == '\t' || uc_is_general_category (c, UC_SPACE_SEPARATOR)); |
| 585 | |
| 586 | scm_ungetc (c, port); |
| 587 | } |
| 588 | |
| 589 | static SCM |
| 590 | scm_read_string (int chr, SCM port, scm_t_read_opts *opts) |
| 591 | #define FUNC_NAME "scm_lreadr" |
| 592 | { |
| 593 | /* For strings smaller than C_STR, this function creates only one Scheme |
| 594 | object (the string returned). */ |
| 595 | |
| 596 | SCM str = SCM_EOL; |
| 597 | size_t c_str_len = 0; |
| 598 | scm_t_wchar c, c_str[READER_STRING_BUFFER_SIZE]; |
| 599 | |
| 600 | /* Need to capture line and column numbers here. */ |
| 601 | long line = SCM_LINUM (port); |
| 602 | int column = SCM_COL (port) - 1; |
| 603 | |
| 604 | while ('"' != (c = scm_getc (port))) |
| 605 | { |
| 606 | if (c == EOF) |
| 607 | { |
| 608 | str_eof: |
| 609 | scm_i_input_error (FUNC_NAME, port, |
| 610 | "end of file in string constant", SCM_EOL); |
| 611 | } |
| 612 | |
| 613 | if (c_str_len + 1 >= READER_STRING_BUFFER_SIZE) |
| 614 | { |
| 615 | str = scm_cons (scm_from_utf32_stringn (c_str, c_str_len), str); |
| 616 | c_str_len = 0; |
| 617 | } |
| 618 | |
| 619 | if (c == '\\') |
| 620 | { |
| 621 | switch (c = scm_getc (port)) |
| 622 | { |
| 623 | case EOF: |
| 624 | goto str_eof; |
| 625 | case '"': |
| 626 | case '\\': |
| 627 | break; |
| 628 | case '\n': |
| 629 | if (opts->hungry_eol_escapes_p) |
| 630 | skip_intraline_whitespace (port); |
| 631 | continue; |
| 632 | case '0': |
| 633 | c = '\0'; |
| 634 | break; |
| 635 | case 'f': |
| 636 | c = '\f'; |
| 637 | break; |
| 638 | case 'n': |
| 639 | c = '\n'; |
| 640 | break; |
| 641 | case 'r': |
| 642 | c = '\r'; |
| 643 | break; |
| 644 | case 't': |
| 645 | c = '\t'; |
| 646 | break; |
| 647 | case 'a': |
| 648 | c = '\007'; |
| 649 | break; |
| 650 | case 'v': |
| 651 | c = '\v'; |
| 652 | break; |
| 653 | case 'b': |
| 654 | c = '\010'; |
| 655 | break; |
| 656 | case 'x': |
| 657 | if (opts->r6rs_escapes_p) |
| 658 | SCM_READ_HEX_ESCAPE (10, ';'); |
| 659 | else |
| 660 | SCM_READ_HEX_ESCAPE (2, '\0'); |
| 661 | break; |
| 662 | case 'u': |
| 663 | if (!opts->r6rs_escapes_p) |
| 664 | { |
| 665 | SCM_READ_HEX_ESCAPE (4, '\0'); |
| 666 | break; |
| 667 | } |
| 668 | case 'U': |
| 669 | if (!opts->r6rs_escapes_p) |
| 670 | { |
| 671 | SCM_READ_HEX_ESCAPE (6, '\0'); |
| 672 | break; |
| 673 | } |
| 674 | default: |
| 675 | bad_escaped: |
| 676 | scm_i_input_error (FUNC_NAME, port, |
| 677 | "illegal character in escape sequence: ~S", |
| 678 | scm_list_1 (SCM_MAKE_CHAR (c))); |
| 679 | } |
| 680 | } |
| 681 | |
| 682 | c_str[c_str_len++] = c; |
| 683 | } |
| 684 | |
| 685 | if (scm_is_null (str)) |
| 686 | /* Fast path: we got a string that fits in C_STR. */ |
| 687 | str = scm_from_utf32_stringn (c_str, c_str_len); |
| 688 | else |
| 689 | { |
| 690 | if (c_str_len > 0) |
| 691 | str = scm_cons (scm_from_utf32_stringn (c_str, c_str_len), str); |
| 692 | |
| 693 | str = scm_string_concatenate_reverse (str, SCM_UNDEFINED, SCM_UNDEFINED); |
| 694 | } |
| 695 | |
| 696 | return maybe_annotate_source (str, port, opts, line, column); |
| 697 | } |
| 698 | #undef FUNC_NAME |
| 699 | |
| 700 | |
| 701 | static SCM |
| 702 | scm_read_number (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
| 703 | { |
| 704 | SCM result, str = SCM_EOL; |
| 705 | char local_buffer[READER_BUFFER_SIZE], *buffer; |
| 706 | size_t bytes_read; |
| 707 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 708 | |
| 709 | /* Need to capture line and column numbers here. */ |
| 710 | long line = SCM_LINUM (port); |
| 711 | int column = SCM_COL (port) - 1; |
| 712 | |
| 713 | scm_ungetc (chr, port); |
| 714 | buffer = read_complete_token (port, opts, local_buffer, sizeof local_buffer, |
| 715 | &bytes_read); |
| 716 | |
| 717 | str = scm_from_stringn (buffer, bytes_read, pt->encoding, pt->ilseq_handler); |
| 718 | |
| 719 | result = scm_string_to_number (str, SCM_UNDEFINED); |
| 720 | if (scm_is_false (result)) |
| 721 | { |
| 722 | /* Return a symbol instead of a number */ |
| 723 | if (opts->case_insensitive_p) |
| 724 | str = scm_string_downcase_x (str); |
| 725 | result = scm_string_to_symbol (str); |
| 726 | } |
| 727 | else if (SCM_NIMP (result)) |
| 728 | result = maybe_annotate_source (result, port, opts, line, column); |
| 729 | |
| 730 | SCM_COL (port) += scm_i_string_length (str); |
| 731 | return result; |
| 732 | } |
| 733 | |
| 734 | static SCM |
| 735 | scm_read_mixed_case_symbol (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
| 736 | { |
| 737 | SCM result; |
| 738 | int ends_with_colon = 0; |
| 739 | size_t bytes_read; |
| 740 | int postfix = (opts->keyword_style == KEYWORD_STYLE_POSTFIX); |
| 741 | char local_buffer[READER_BUFFER_SIZE], *buffer; |
| 742 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 743 | SCM str; |
| 744 | |
| 745 | scm_ungetc (chr, port); |
| 746 | buffer = read_complete_token (port, opts, local_buffer, sizeof local_buffer, |
| 747 | &bytes_read); |
| 748 | if (bytes_read > 0) |
| 749 | ends_with_colon = buffer[bytes_read - 1] == ':'; |
| 750 | |
| 751 | if (postfix && ends_with_colon && (bytes_read > 1)) |
| 752 | { |
| 753 | str = scm_from_stringn (buffer, bytes_read - 1, |
| 754 | pt->encoding, pt->ilseq_handler); |
| 755 | |
| 756 | if (opts->case_insensitive_p) |
| 757 | str = scm_string_downcase_x (str); |
| 758 | result = scm_symbol_to_keyword (scm_string_to_symbol (str)); |
| 759 | } |
| 760 | else |
| 761 | { |
| 762 | str = scm_from_stringn (buffer, bytes_read, |
| 763 | pt->encoding, pt->ilseq_handler); |
| 764 | |
| 765 | if (opts->case_insensitive_p) |
| 766 | str = scm_string_downcase_x (str); |
| 767 | result = scm_string_to_symbol (str); |
| 768 | } |
| 769 | |
| 770 | SCM_COL (port) += scm_i_string_length (str); |
| 771 | return result; |
| 772 | } |
| 773 | |
| 774 | static SCM |
| 775 | scm_read_number_and_radix (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
| 776 | #define FUNC_NAME "scm_lreadr" |
| 777 | { |
| 778 | SCM result; |
| 779 | size_t read; |
| 780 | char local_buffer[READER_BUFFER_SIZE], *buffer; |
| 781 | unsigned int radix; |
| 782 | SCM str; |
| 783 | scm_t_port *pt; |
| 784 | |
| 785 | switch (chr) |
| 786 | { |
| 787 | case 'B': |
| 788 | case 'b': |
| 789 | radix = 2; |
| 790 | break; |
| 791 | |
| 792 | case 'o': |
| 793 | case 'O': |
| 794 | radix = 8; |
| 795 | break; |
| 796 | |
| 797 | case 'd': |
| 798 | case 'D': |
| 799 | radix = 10; |
| 800 | break; |
| 801 | |
| 802 | case 'x': |
| 803 | case 'X': |
| 804 | radix = 16; |
| 805 | break; |
| 806 | |
| 807 | default: |
| 808 | scm_ungetc (chr, port); |
| 809 | scm_ungetc ('#', port); |
| 810 | radix = 10; |
| 811 | } |
| 812 | |
| 813 | buffer = read_complete_token (port, opts, local_buffer, sizeof local_buffer, |
| 814 | &read); |
| 815 | |
| 816 | pt = SCM_PTAB_ENTRY (port); |
| 817 | str = scm_from_stringn (buffer, read, pt->encoding, pt->ilseq_handler); |
| 818 | |
| 819 | result = scm_string_to_number (str, scm_from_uint (radix)); |
| 820 | |
| 821 | SCM_COL (port) += scm_i_string_length (str); |
| 822 | |
| 823 | if (scm_is_true (result)) |
| 824 | return result; |
| 825 | |
| 826 | scm_i_input_error (FUNC_NAME, port, "unknown # object", SCM_EOL); |
| 827 | |
| 828 | return SCM_BOOL_F; |
| 829 | } |
| 830 | #undef FUNC_NAME |
| 831 | |
| 832 | static SCM |
| 833 | scm_read_quote (int chr, SCM port, scm_t_read_opts *opts) |
| 834 | { |
| 835 | SCM p; |
| 836 | long line = SCM_LINUM (port); |
| 837 | int column = SCM_COL (port) - 1; |
| 838 | |
| 839 | switch (chr) |
| 840 | { |
| 841 | case '`': |
| 842 | p = scm_sym_quasiquote; |
| 843 | break; |
| 844 | |
| 845 | case '\'': |
| 846 | p = scm_sym_quote; |
| 847 | break; |
| 848 | |
| 849 | case ',': |
| 850 | { |
| 851 | scm_t_wchar c; |
| 852 | |
| 853 | c = scm_getc (port); |
| 854 | if ('@' == c) |
| 855 | p = scm_sym_uq_splicing; |
| 856 | else |
| 857 | { |
| 858 | scm_ungetc (c, port); |
| 859 | p = scm_sym_unquote; |
| 860 | } |
| 861 | break; |
| 862 | } |
| 863 | |
| 864 | default: |
| 865 | fprintf (stderr, "%s: unhandled quote character (%i)\n", |
| 866 | "scm_read_quote", chr); |
| 867 | abort (); |
| 868 | } |
| 869 | |
| 870 | p = scm_cons2 (p, scm_read_expression (port, opts), SCM_EOL); |
| 871 | return maybe_annotate_source (p, port, opts, line, column); |
| 872 | } |
| 873 | |
| 874 | SCM_SYMBOL (sym_syntax, "syntax"); |
| 875 | SCM_SYMBOL (sym_quasisyntax, "quasisyntax"); |
| 876 | SCM_SYMBOL (sym_unsyntax, "unsyntax"); |
| 877 | SCM_SYMBOL (sym_unsyntax_splicing, "unsyntax-splicing"); |
| 878 | |
| 879 | static SCM |
| 880 | scm_read_syntax (int chr, SCM port, scm_t_read_opts *opts) |
| 881 | { |
| 882 | SCM p; |
| 883 | long line = SCM_LINUM (port); |
| 884 | int column = SCM_COL (port) - 1; |
| 885 | |
| 886 | switch (chr) |
| 887 | { |
| 888 | case '`': |
| 889 | p = sym_quasisyntax; |
| 890 | break; |
| 891 | |
| 892 | case '\'': |
| 893 | p = sym_syntax; |
| 894 | break; |
| 895 | |
| 896 | case ',': |
| 897 | { |
| 898 | int c; |
| 899 | |
| 900 | c = scm_getc (port); |
| 901 | if ('@' == c) |
| 902 | p = sym_unsyntax_splicing; |
| 903 | else |
| 904 | { |
| 905 | scm_ungetc (c, port); |
| 906 | p = sym_unsyntax; |
| 907 | } |
| 908 | break; |
| 909 | } |
| 910 | |
| 911 | default: |
| 912 | fprintf (stderr, "%s: unhandled syntax character (%i)\n", |
| 913 | "scm_read_syntax", chr); |
| 914 | abort (); |
| 915 | } |
| 916 | |
| 917 | p = scm_cons2 (p, scm_read_expression (port, opts), SCM_EOL); |
| 918 | return maybe_annotate_source (p, port, opts, line, column); |
| 919 | } |
| 920 | |
| 921 | static SCM |
| 922 | scm_read_nil (int chr, SCM port, scm_t_read_opts *opts) |
| 923 | { |
| 924 | SCM id = scm_read_mixed_case_symbol (chr, port, opts); |
| 925 | |
| 926 | if (!scm_is_eq (id, sym_nil)) |
| 927 | scm_i_input_error ("scm_read_nil", port, |
| 928 | "unexpected input while reading #nil: ~a", |
| 929 | scm_list_1 (id)); |
| 930 | |
| 931 | return SCM_ELISP_NIL; |
| 932 | } |
| 933 | |
| 934 | static SCM |
| 935 | scm_read_semicolon_comment (int chr, SCM port) |
| 936 | { |
| 937 | int c; |
| 938 | |
| 939 | /* We use the get_byte here because there is no need to get the |
| 940 | locale correct with comment input. This presumes that newline |
| 941 | always represents itself no matter what the encoding is. */ |
| 942 | for (c = scm_get_byte_or_eof (port); |
| 943 | (c != EOF) && (c != '\n'); |
| 944 | c = scm_get_byte_or_eof (port)); |
| 945 | |
| 946 | return SCM_UNSPECIFIED; |
| 947 | } |
| 948 | |
| 949 | \f |
| 950 | /* Sharp readers, i.e. readers called after a `#' sign has been read. */ |
| 951 | |
| 952 | static SCM |
| 953 | scm_read_boolean (int chr, SCM port) |
| 954 | { |
| 955 | switch (chr) |
| 956 | { |
| 957 | case 't': |
| 958 | case 'T': |
| 959 | return SCM_BOOL_T; |
| 960 | |
| 961 | case 'f': |
| 962 | case 'F': |
| 963 | return SCM_BOOL_F; |
| 964 | } |
| 965 | |
| 966 | return SCM_UNSPECIFIED; |
| 967 | } |
| 968 | |
| 969 | static SCM |
| 970 | scm_read_character (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
| 971 | #define FUNC_NAME "scm_lreadr" |
| 972 | { |
| 973 | char buffer[READER_CHAR_NAME_MAX_SIZE]; |
| 974 | SCM charname; |
| 975 | size_t charname_len, bytes_read; |
| 976 | scm_t_wchar cp; |
| 977 | int overflow; |
| 978 | scm_t_port *pt; |
| 979 | |
| 980 | overflow = read_token (port, opts, buffer, READER_CHAR_NAME_MAX_SIZE, |
| 981 | &bytes_read); |
| 982 | if (overflow) |
| 983 | scm_i_input_error (FUNC_NAME, port, "character name too long", SCM_EOL); |
| 984 | |
| 985 | if (bytes_read == 0) |
| 986 | { |
| 987 | chr = scm_getc (port); |
| 988 | if (chr == EOF) |
| 989 | scm_i_input_error (FUNC_NAME, port, "unexpected end of file " |
| 990 | "while reading character", SCM_EOL); |
| 991 | |
| 992 | /* CHR must be a token delimiter, like a whitespace. */ |
| 993 | return (SCM_MAKE_CHAR (chr)); |
| 994 | } |
| 995 | |
| 996 | pt = SCM_PTAB_ENTRY (port); |
| 997 | |
| 998 | /* Simple ASCII characters can be processed immediately. Also, simple |
| 999 | ISO-8859-1 characters can be processed immediately if the encoding for this |
| 1000 | port is ISO-8859-1. */ |
| 1001 | if (bytes_read == 1 && ((unsigned char) buffer[0] <= 127 || pt->encoding == NULL)) |
| 1002 | { |
| 1003 | SCM_COL (port) += 1; |
| 1004 | return SCM_MAKE_CHAR (buffer[0]); |
| 1005 | } |
| 1006 | |
| 1007 | /* Otherwise, convert the buffer into a proper scheme string for |
| 1008 | processing. */ |
| 1009 | charname = scm_from_stringn (buffer, bytes_read, pt->encoding, |
| 1010 | pt->ilseq_handler); |
| 1011 | charname_len = scm_i_string_length (charname); |
| 1012 | SCM_COL (port) += charname_len; |
| 1013 | cp = scm_i_string_ref (charname, 0); |
| 1014 | if (charname_len == 1) |
| 1015 | return SCM_MAKE_CHAR (cp); |
| 1016 | |
| 1017 | /* Ignore dotted circles, which may be used to keep combining characters from |
| 1018 | combining with the backslash in #\charname. */ |
| 1019 | if (cp == SCM_CODEPOINT_DOTTED_CIRCLE && charname_len == 2) |
| 1020 | return SCM_MAKE_CHAR (scm_i_string_ref (charname, 1)); |
| 1021 | |
| 1022 | if (cp >= '0' && cp < '8') |
| 1023 | { |
| 1024 | /* Dirk:FIXME:: This type of character syntax is not R5RS |
| 1025 | * compliant. Further, it should be verified that the constant |
| 1026 | * does only consist of octal digits. */ |
| 1027 | SCM p = scm_string_to_number (charname, scm_from_uint (8)); |
| 1028 | if (SCM_I_INUMP (p)) |
| 1029 | { |
| 1030 | scm_t_wchar c = scm_to_uint32 (p); |
| 1031 | if (SCM_IS_UNICODE_CHAR (c)) |
| 1032 | return SCM_MAKE_CHAR (c); |
| 1033 | else |
| 1034 | scm_i_input_error (FUNC_NAME, port, |
| 1035 | "out-of-range octal character escape: ~a", |
| 1036 | scm_list_1 (charname)); |
| 1037 | } |
| 1038 | } |
| 1039 | |
| 1040 | if (cp == 'x' && (charname_len > 1)) |
| 1041 | { |
| 1042 | SCM p; |
| 1043 | |
| 1044 | /* Convert from hex, skipping the initial 'x' character in CHARNAME */ |
| 1045 | p = scm_string_to_number (scm_c_substring (charname, 1, charname_len), |
| 1046 | scm_from_uint (16)); |
| 1047 | if (SCM_I_INUMP (p)) |
| 1048 | { |
| 1049 | scm_t_wchar c = scm_to_uint32 (p); |
| 1050 | if (SCM_IS_UNICODE_CHAR (c)) |
| 1051 | return SCM_MAKE_CHAR (c); |
| 1052 | else |
| 1053 | scm_i_input_error (FUNC_NAME, port, |
| 1054 | "out-of-range hex character escape: ~a", |
| 1055 | scm_list_1 (charname)); |
| 1056 | } |
| 1057 | } |
| 1058 | |
| 1059 | /* The names of characters should never have non-Latin1 |
| 1060 | characters. */ |
| 1061 | if (scm_i_is_narrow_string (charname) |
| 1062 | || scm_i_try_narrow_string (charname)) |
| 1063 | { SCM ch = scm_i_charname_to_char (scm_i_string_chars (charname), |
| 1064 | charname_len); |
| 1065 | if (scm_is_true (ch)) |
| 1066 | return ch; |
| 1067 | } |
| 1068 | |
| 1069 | scm_i_input_error (FUNC_NAME, port, "unknown character name ~a", |
| 1070 | scm_list_1 (charname)); |
| 1071 | |
| 1072 | return SCM_UNSPECIFIED; |
| 1073 | } |
| 1074 | #undef FUNC_NAME |
| 1075 | |
| 1076 | static SCM |
| 1077 | scm_read_keyword (int chr, SCM port, scm_t_read_opts *opts) |
| 1078 | { |
| 1079 | SCM symbol; |
| 1080 | |
| 1081 | /* Read the symbol that comprises the keyword. Doing this instead of |
| 1082 | invoking a specific symbol reader function allows `scm_read_keyword ()' |
| 1083 | to adapt to the delimiters currently valid of symbols. |
| 1084 | |
| 1085 | XXX: This implementation allows sloppy syntaxes like `#: key'. */ |
| 1086 | symbol = scm_read_expression (port, opts); |
| 1087 | if (!scm_is_symbol (symbol)) |
| 1088 | scm_i_input_error ("scm_read_keyword", port, |
| 1089 | "keyword prefix `~a' not followed by a symbol: ~s", |
| 1090 | scm_list_2 (SCM_MAKE_CHAR (chr), symbol)); |
| 1091 | |
| 1092 | return (scm_symbol_to_keyword (symbol)); |
| 1093 | } |
| 1094 | |
| 1095 | static SCM |
| 1096 | scm_read_vector (int chr, SCM port, scm_t_read_opts *opts, |
| 1097 | long line, int column) |
| 1098 | { |
| 1099 | /* Note: We call `scm_read_sexp ()' rather than READER here in order to |
| 1100 | guarantee that it's going to do what we want. After all, this is an |
| 1101 | implementation detail of `scm_read_vector ()', not a desirable |
| 1102 | property. */ |
| 1103 | return maybe_annotate_source (scm_vector (scm_read_sexp (chr, port, opts)), |
| 1104 | port, opts, line, column); |
| 1105 | } |
| 1106 | |
| 1107 | /* Helper used by scm_read_array */ |
| 1108 | static int |
| 1109 | read_decimal_integer (SCM port, int c, ssize_t *resp) |
| 1110 | { |
| 1111 | ssize_t sign = 1; |
| 1112 | ssize_t res = 0; |
| 1113 | int got_it = 0; |
| 1114 | |
| 1115 | if (c == '-') |
| 1116 | { |
| 1117 | sign = -1; |
| 1118 | c = scm_getc (port); |
| 1119 | } |
| 1120 | |
| 1121 | while ('0' <= c && c <= '9') |
| 1122 | { |
| 1123 | res = 10*res + c-'0'; |
| 1124 | got_it = 1; |
| 1125 | c = scm_getc (port); |
| 1126 | } |
| 1127 | |
| 1128 | if (got_it) |
| 1129 | *resp = sign * res; |
| 1130 | return c; |
| 1131 | } |
| 1132 | |
| 1133 | /* Read an array. This function can also read vectors and uniform |
| 1134 | vectors. Also, the conflict between '#f' and '#f32' and '#f64' is |
| 1135 | handled here. |
| 1136 | |
| 1137 | C is the first character read after the '#'. */ |
| 1138 | static SCM |
| 1139 | scm_read_array (int c, SCM port, scm_t_read_opts *opts, long line, int column) |
| 1140 | { |
| 1141 | ssize_t rank; |
| 1142 | scm_t_wchar tag_buf[8]; |
| 1143 | int tag_len; |
| 1144 | |
| 1145 | SCM tag, shape = SCM_BOOL_F, elements, array; |
| 1146 | |
| 1147 | /* XXX - shortcut for ordinary vectors. Shouldn't be necessary but |
| 1148 | the array code can not deal with zero-length dimensions yet, and |
| 1149 | we want to allow zero-length vectors, of course. */ |
| 1150 | if (c == '(') |
| 1151 | return scm_read_vector (c, port, opts, line, column); |
| 1152 | |
| 1153 | /* Disambiguate between '#f' and uniform floating point vectors. */ |
| 1154 | if (c == 'f') |
| 1155 | { |
| 1156 | c = scm_getc (port); |
| 1157 | if (c != '3' && c != '6') |
| 1158 | { |
| 1159 | if (c != EOF) |
| 1160 | scm_ungetc (c, port); |
| 1161 | return SCM_BOOL_F; |
| 1162 | } |
| 1163 | rank = 1; |
| 1164 | tag_buf[0] = 'f'; |
| 1165 | tag_len = 1; |
| 1166 | goto continue_reading_tag; |
| 1167 | } |
| 1168 | |
| 1169 | /* Read rank. */ |
| 1170 | rank = 1; |
| 1171 | c = read_decimal_integer (port, c, &rank); |
| 1172 | if (rank < 0) |
| 1173 | scm_i_input_error (NULL, port, "array rank must be non-negative", |
| 1174 | SCM_EOL); |
| 1175 | |
| 1176 | /* Read tag. */ |
| 1177 | tag_len = 0; |
| 1178 | continue_reading_tag: |
| 1179 | while (c != EOF && c != '(' && c != '@' && c != ':' |
| 1180 | && tag_len < sizeof tag_buf / sizeof tag_buf[0]) |
| 1181 | { |
| 1182 | tag_buf[tag_len++] = c; |
| 1183 | c = scm_getc (port); |
| 1184 | } |
| 1185 | if (tag_len == 0) |
| 1186 | tag = SCM_BOOL_T; |
| 1187 | else |
| 1188 | { |
| 1189 | tag = scm_string_to_symbol (scm_from_utf32_stringn (tag_buf, tag_len)); |
| 1190 | if (tag_len == sizeof tag_buf / sizeof tag_buf[0]) |
| 1191 | scm_i_input_error (NULL, port, "invalid array tag, starting with: ~a", |
| 1192 | scm_list_1 (tag)); |
| 1193 | } |
| 1194 | |
| 1195 | /* Read shape. */ |
| 1196 | if (c == '@' || c == ':') |
| 1197 | { |
| 1198 | shape = SCM_EOL; |
| 1199 | |
| 1200 | do |
| 1201 | { |
| 1202 | ssize_t lbnd = 0, len = 0; |
| 1203 | SCM s; |
| 1204 | |
| 1205 | if (c == '@') |
| 1206 | { |
| 1207 | c = scm_getc (port); |
| 1208 | c = read_decimal_integer (port, c, &lbnd); |
| 1209 | } |
| 1210 | |
| 1211 | s = scm_from_ssize_t (lbnd); |
| 1212 | |
| 1213 | if (c == ':') |
| 1214 | { |
| 1215 | c = scm_getc (port); |
| 1216 | c = read_decimal_integer (port, c, &len); |
| 1217 | if (len < 0) |
| 1218 | scm_i_input_error (NULL, port, |
| 1219 | "array length must be non-negative", |
| 1220 | SCM_EOL); |
| 1221 | |
| 1222 | s = scm_list_2 (s, scm_from_ssize_t (lbnd+len-1)); |
| 1223 | } |
| 1224 | |
| 1225 | shape = scm_cons (s, shape); |
| 1226 | } while (c == '@' || c == ':'); |
| 1227 | |
| 1228 | shape = scm_reverse_x (shape, SCM_EOL); |
| 1229 | } |
| 1230 | |
| 1231 | /* Read nested lists of elements. */ |
| 1232 | if (c != '(') |
| 1233 | scm_i_input_error (NULL, port, |
| 1234 | "missing '(' in vector or array literal", |
| 1235 | SCM_EOL); |
| 1236 | elements = scm_read_sexp (c, port, opts); |
| 1237 | |
| 1238 | if (scm_is_false (shape)) |
| 1239 | shape = scm_from_ssize_t (rank); |
| 1240 | else if (scm_ilength (shape) != rank) |
| 1241 | scm_i_input_error |
| 1242 | (NULL, port, |
| 1243 | "the number of shape specifications must match the array rank", |
| 1244 | SCM_EOL); |
| 1245 | |
| 1246 | /* Handle special print syntax of rank zero arrays; see |
| 1247 | scm_i_print_array for a rationale. */ |
| 1248 | if (rank == 0) |
| 1249 | { |
| 1250 | if (!scm_is_pair (elements)) |
| 1251 | scm_i_input_error (NULL, port, |
| 1252 | "too few elements in array literal, need 1", |
| 1253 | SCM_EOL); |
| 1254 | if (!scm_is_null (SCM_CDR (elements))) |
| 1255 | scm_i_input_error (NULL, port, |
| 1256 | "too many elements in array literal, want 1", |
| 1257 | SCM_EOL); |
| 1258 | elements = SCM_CAR (elements); |
| 1259 | } |
| 1260 | |
| 1261 | /* Construct array, annotate with source location, and return. */ |
| 1262 | array = scm_list_to_typed_array (tag, shape, elements); |
| 1263 | return maybe_annotate_source (array, port, opts, line, column); |
| 1264 | } |
| 1265 | |
| 1266 | static SCM |
| 1267 | scm_read_srfi4_vector (int chr, SCM port, scm_t_read_opts *opts, |
| 1268 | long line, int column) |
| 1269 | { |
| 1270 | return scm_read_array (chr, port, opts, line, column); |
| 1271 | } |
| 1272 | |
| 1273 | static SCM |
| 1274 | scm_read_bytevector (scm_t_wchar chr, SCM port, scm_t_read_opts *opts, |
| 1275 | long line, int column) |
| 1276 | { |
| 1277 | chr = scm_getc (port); |
| 1278 | if (chr != 'u') |
| 1279 | goto syntax; |
| 1280 | |
| 1281 | chr = scm_getc (port); |
| 1282 | if (chr != '8') |
| 1283 | goto syntax; |
| 1284 | |
| 1285 | chr = scm_getc (port); |
| 1286 | if (chr != '(') |
| 1287 | goto syntax; |
| 1288 | |
| 1289 | return maybe_annotate_source |
| 1290 | (scm_u8_list_to_bytevector (scm_read_sexp (chr, port, opts)), |
| 1291 | port, opts, line, column); |
| 1292 | |
| 1293 | syntax: |
| 1294 | scm_i_input_error ("read_bytevector", port, |
| 1295 | "invalid bytevector prefix", |
| 1296 | SCM_MAKE_CHAR (chr)); |
| 1297 | return SCM_UNSPECIFIED; |
| 1298 | } |
| 1299 | |
| 1300 | static SCM |
| 1301 | scm_read_guile_bit_vector (scm_t_wchar chr, SCM port, scm_t_read_opts *opts, |
| 1302 | long line, int column) |
| 1303 | { |
| 1304 | /* Read the `#*10101'-style read syntax for bit vectors in Guile. This is |
| 1305 | terribly inefficient but who cares? */ |
| 1306 | SCM s_bits = SCM_EOL; |
| 1307 | |
| 1308 | for (chr = scm_getc (port); |
| 1309 | (chr != EOF) && ((chr == '0') || (chr == '1')); |
| 1310 | chr = scm_getc (port)) |
| 1311 | { |
| 1312 | s_bits = scm_cons ((chr == '0') ? SCM_BOOL_F : SCM_BOOL_T, s_bits); |
| 1313 | } |
| 1314 | |
| 1315 | if (chr != EOF) |
| 1316 | scm_ungetc (chr, port); |
| 1317 | |
| 1318 | return maybe_annotate_source |
| 1319 | (scm_bitvector (scm_reverse_x (s_bits, SCM_EOL)), |
| 1320 | port, opts, line, column); |
| 1321 | } |
| 1322 | |
| 1323 | static SCM |
| 1324 | scm_read_scsh_block_comment (scm_t_wchar chr, SCM port) |
| 1325 | { |
| 1326 | int bang_seen = 0; |
| 1327 | |
| 1328 | for (;;) |
| 1329 | { |
| 1330 | int c = scm_getc (port); |
| 1331 | |
| 1332 | if (c == EOF) |
| 1333 | scm_i_input_error ("skip_block_comment", port, |
| 1334 | "unterminated `#! ... !#' comment", SCM_EOL); |
| 1335 | |
| 1336 | if (c == '!') |
| 1337 | bang_seen = 1; |
| 1338 | else if (c == '#' && bang_seen) |
| 1339 | break; |
| 1340 | else |
| 1341 | bang_seen = 0; |
| 1342 | } |
| 1343 | |
| 1344 | return SCM_UNSPECIFIED; |
| 1345 | } |
| 1346 | |
| 1347 | static void set_port_case_insensitive_p (SCM port, scm_t_read_opts *opts, |
| 1348 | int value); |
| 1349 | static void set_port_square_brackets_p (SCM port, scm_t_read_opts *opts, |
| 1350 | int value); |
| 1351 | static void set_port_curly_infix_p (SCM port, scm_t_read_opts *opts, |
| 1352 | int value); |
| 1353 | |
| 1354 | static SCM |
| 1355 | scm_read_shebang (scm_t_wchar chr, SCM port, scm_t_read_opts *opts) |
| 1356 | { |
| 1357 | char name[READER_DIRECTIVE_NAME_MAX_SIZE + 1]; |
| 1358 | int c; |
| 1359 | int i = 0; |
| 1360 | |
| 1361 | while (i <= READER_DIRECTIVE_NAME_MAX_SIZE) |
| 1362 | { |
| 1363 | c = scm_getc (port); |
| 1364 | if (c == EOF) |
| 1365 | scm_i_input_error ("skip_block_comment", port, |
| 1366 | "unterminated `#! ... !#' comment", SCM_EOL); |
| 1367 | else if (('a' <= c && c <= 'z') || ('0' <= c && c <= '9') || c == '-') |
| 1368 | name[i++] = c; |
| 1369 | else if (CHAR_IS_DELIMITER (c)) |
| 1370 | { |
| 1371 | scm_ungetc (c, port); |
| 1372 | name[i] = '\0'; |
| 1373 | if (0 == strcmp ("r6rs", name)) |
| 1374 | ; /* Silently ignore */ |
| 1375 | else if (0 == strcmp ("fold-case", name)) |
| 1376 | set_port_case_insensitive_p (port, opts, 1); |
| 1377 | else if (0 == strcmp ("no-fold-case", name)) |
| 1378 | set_port_case_insensitive_p (port, opts, 0); |
| 1379 | else if (0 == strcmp ("curly-infix", name)) |
| 1380 | set_port_curly_infix_p (port, opts, 1); |
| 1381 | else if (0 == strcmp ("curly-infix-and-bracket-lists", name)) |
| 1382 | { |
| 1383 | set_port_curly_infix_p (port, opts, 1); |
| 1384 | set_port_square_brackets_p (port, opts, 0); |
| 1385 | } |
| 1386 | else |
| 1387 | break; |
| 1388 | |
| 1389 | return SCM_UNSPECIFIED; |
| 1390 | } |
| 1391 | else |
| 1392 | { |
| 1393 | scm_ungetc (c, port); |
| 1394 | break; |
| 1395 | } |
| 1396 | } |
| 1397 | while (i > 0) |
| 1398 | scm_ungetc (name[--i], port); |
| 1399 | return scm_read_scsh_block_comment (chr, port); |
| 1400 | } |
| 1401 | |
| 1402 | static SCM |
| 1403 | scm_read_r6rs_block_comment (scm_t_wchar chr, SCM port) |
| 1404 | { |
| 1405 | /* Unlike SCSH-style block comments, SRFI-30/R6RS block comments may be |
| 1406 | nested. So care must be taken. */ |
| 1407 | int nesting_level = 1; |
| 1408 | |
| 1409 | int a = scm_getc (port); |
| 1410 | |
| 1411 | if (a == EOF) |
| 1412 | scm_i_input_error ("scm_read_r6rs_block_comment", port, |
| 1413 | "unterminated `#| ... |#' comment", SCM_EOL); |
| 1414 | |
| 1415 | while (nesting_level > 0) |
| 1416 | { |
| 1417 | int b = scm_getc (port); |
| 1418 | |
| 1419 | if (b == EOF) |
| 1420 | scm_i_input_error ("scm_read_r6rs_block_comment", port, |
| 1421 | "unterminated `#| ... |#' comment", SCM_EOL); |
| 1422 | |
| 1423 | if (a == '|' && b == '#') |
| 1424 | { |
| 1425 | nesting_level--; |
| 1426 | b = EOF; |
| 1427 | } |
| 1428 | else if (a == '#' && b == '|') |
| 1429 | { |
| 1430 | nesting_level++; |
| 1431 | b = EOF; |
| 1432 | } |
| 1433 | |
| 1434 | a = b; |
| 1435 | } |
| 1436 | |
| 1437 | return SCM_UNSPECIFIED; |
| 1438 | } |
| 1439 | |
| 1440 | static SCM |
| 1441 | scm_read_commented_expression (scm_t_wchar chr, SCM port, |
| 1442 | scm_t_read_opts *opts) |
| 1443 | { |
| 1444 | scm_t_wchar c; |
| 1445 | |
| 1446 | c = flush_ws (port, opts, (char *) NULL); |
| 1447 | if (EOF == c) |
| 1448 | scm_i_input_error ("read_commented_expression", port, |
| 1449 | "no expression after #; comment", SCM_EOL); |
| 1450 | scm_ungetc (c, port); |
| 1451 | scm_read_expression (port, opts); |
| 1452 | return SCM_UNSPECIFIED; |
| 1453 | } |
| 1454 | |
| 1455 | static SCM |
| 1456 | scm_read_extended_symbol (scm_t_wchar chr, SCM port) |
| 1457 | { |
| 1458 | /* Guile's extended symbol read syntax looks like this: |
| 1459 | |
| 1460 | #{This is all a symbol name}# |
| 1461 | |
| 1462 | So here, CHR is expected to be `{'. */ |
| 1463 | int saw_brace = 0; |
| 1464 | size_t len = 0; |
| 1465 | SCM buf = scm_i_make_string (1024, NULL, 0); |
| 1466 | |
| 1467 | buf = scm_i_string_start_writing (buf); |
| 1468 | |
| 1469 | while ((chr = scm_getc (port)) != EOF) |
| 1470 | { |
| 1471 | if (saw_brace) |
| 1472 | { |
| 1473 | if (chr == '#') |
| 1474 | { |
| 1475 | break; |
| 1476 | } |
| 1477 | else |
| 1478 | { |
| 1479 | saw_brace = 0; |
| 1480 | scm_i_string_set_x (buf, len++, '}'); |
| 1481 | } |
| 1482 | } |
| 1483 | |
| 1484 | if (chr == '}') |
| 1485 | saw_brace = 1; |
| 1486 | else if (chr == '\\') |
| 1487 | { |
| 1488 | /* It used to be that print.c would print extended-read-syntax |
| 1489 | symbols with backslashes before "non-standard" chars, but |
| 1490 | this routine wouldn't do anything with those escapes. |
| 1491 | Bummer. What we've done is to change print.c to output |
| 1492 | R6RS hex escapes for those characters, relying on the fact |
| 1493 | that the extended read syntax would never put a `\' before |
| 1494 | an `x'. For now, we just ignore other instances of |
| 1495 | backslash in the string. */ |
| 1496 | switch ((chr = scm_getc (port))) |
| 1497 | { |
| 1498 | case EOF: |
| 1499 | goto done; |
| 1500 | case 'x': |
| 1501 | { |
| 1502 | scm_t_wchar c; |
| 1503 | |
| 1504 | SCM_READ_HEX_ESCAPE (10, ';'); |
| 1505 | scm_i_string_set_x (buf, len++, c); |
| 1506 | break; |
| 1507 | |
| 1508 | str_eof: |
| 1509 | chr = EOF; |
| 1510 | goto done; |
| 1511 | |
| 1512 | bad_escaped: |
| 1513 | scm_i_string_stop_writing (); |
| 1514 | scm_i_input_error ("scm_read_extended_symbol", port, |
| 1515 | "illegal character in escape sequence: ~S", |
| 1516 | scm_list_1 (SCM_MAKE_CHAR (c))); |
| 1517 | break; |
| 1518 | } |
| 1519 | default: |
| 1520 | scm_i_string_set_x (buf, len++, chr); |
| 1521 | break; |
| 1522 | } |
| 1523 | } |
| 1524 | else |
| 1525 | scm_i_string_set_x (buf, len++, chr); |
| 1526 | |
| 1527 | if (len >= scm_i_string_length (buf) - 2) |
| 1528 | { |
| 1529 | SCM addy; |
| 1530 | |
| 1531 | scm_i_string_stop_writing (); |
| 1532 | addy = scm_i_make_string (1024, NULL, 0); |
| 1533 | buf = scm_string_append (scm_list_2 (buf, addy)); |
| 1534 | len = 0; |
| 1535 | buf = scm_i_string_start_writing (buf); |
| 1536 | } |
| 1537 | } |
| 1538 | |
| 1539 | done: |
| 1540 | scm_i_string_stop_writing (); |
| 1541 | if (chr == EOF) |
| 1542 | scm_i_input_error ("scm_read_extended_symbol", port, |
| 1543 | "end of file while reading symbol", SCM_EOL); |
| 1544 | |
| 1545 | return (scm_string_to_symbol (scm_c_substring (buf, 0, len))); |
| 1546 | } |
| 1547 | |
| 1548 | |
| 1549 | \f |
| 1550 | /* Top-level token readers, i.e., dispatchers. */ |
| 1551 | |
| 1552 | static SCM |
| 1553 | scm_read_sharp_extension (int chr, SCM port, scm_t_read_opts *opts) |
| 1554 | { |
| 1555 | SCM proc; |
| 1556 | |
| 1557 | proc = scm_get_hash_procedure (chr); |
| 1558 | if (scm_is_true (scm_procedure_p (proc))) |
| 1559 | { |
| 1560 | long line = SCM_LINUM (port); |
| 1561 | int column = SCM_COL (port) - 2; |
| 1562 | SCM got; |
| 1563 | |
| 1564 | got = scm_call_2 (proc, SCM_MAKE_CHAR (chr), port); |
| 1565 | |
| 1566 | if (opts->record_positions_p && SCM_NIMP (got) |
| 1567 | && !scm_i_has_source_properties (got)) |
| 1568 | scm_i_set_source_properties_x (got, line, column, SCM_FILENAME (port)); |
| 1569 | |
| 1570 | return got; |
| 1571 | } |
| 1572 | |
| 1573 | return SCM_UNSPECIFIED; |
| 1574 | } |
| 1575 | |
| 1576 | /* The reader for the sharp `#' character. It basically dispatches reads |
| 1577 | among the above token readers. */ |
| 1578 | static SCM |
| 1579 | scm_read_sharp (scm_t_wchar chr, SCM port, scm_t_read_opts *opts, |
| 1580 | long line, int column) |
| 1581 | #define FUNC_NAME "scm_lreadr" |
| 1582 | { |
| 1583 | SCM result; |
| 1584 | |
| 1585 | chr = scm_getc (port); |
| 1586 | |
| 1587 | result = scm_read_sharp_extension (chr, port, opts); |
| 1588 | if (!scm_is_eq (result, SCM_UNSPECIFIED)) |
| 1589 | return result; |
| 1590 | |
| 1591 | switch (chr) |
| 1592 | { |
| 1593 | case '\\': |
| 1594 | return (scm_read_character (chr, port, opts)); |
| 1595 | case '(': |
| 1596 | return (scm_read_vector (chr, port, opts, line, column)); |
| 1597 | case 's': |
| 1598 | case 'u': |
| 1599 | case 'f': |
| 1600 | case 'c': |
| 1601 | /* This one may return either a boolean or an SRFI-4 vector. */ |
| 1602 | return (scm_read_srfi4_vector (chr, port, opts, line, column)); |
| 1603 | case 'v': |
| 1604 | return (scm_read_bytevector (chr, port, opts, line, column)); |
| 1605 | case '*': |
| 1606 | return (scm_read_guile_bit_vector (chr, port, opts, line, column)); |
| 1607 | case 't': |
| 1608 | case 'T': |
| 1609 | case 'F': |
| 1610 | return (scm_read_boolean (chr, port)); |
| 1611 | case ':': |
| 1612 | return (scm_read_keyword (chr, port, opts)); |
| 1613 | case '0': case '1': case '2': case '3': case '4': |
| 1614 | case '5': case '6': case '7': case '8': case '9': |
| 1615 | case '@': |
| 1616 | #if SCM_ENABLE_DEPRECATED |
| 1617 | /* See below for 'i' and 'e'. */ |
| 1618 | case 'a': |
| 1619 | case 'y': |
| 1620 | case 'h': |
| 1621 | case 'l': |
| 1622 | #endif |
| 1623 | return (scm_read_array (chr, port, opts, line, column)); |
| 1624 | |
| 1625 | case 'i': |
| 1626 | case 'e': |
| 1627 | #if SCM_ENABLE_DEPRECATED |
| 1628 | { |
| 1629 | /* When next char is '(', it really is an old-style |
| 1630 | uniform array. */ |
| 1631 | scm_t_wchar next_c = scm_getc (port); |
| 1632 | if (next_c != EOF) |
| 1633 | scm_ungetc (next_c, port); |
| 1634 | if (next_c == '(') |
| 1635 | return scm_read_array (chr, port, opts, line, column); |
| 1636 | /* Fall through. */ |
| 1637 | } |
| 1638 | #endif |
| 1639 | case 'b': |
| 1640 | case 'B': |
| 1641 | case 'o': |
| 1642 | case 'O': |
| 1643 | case 'd': |
| 1644 | case 'D': |
| 1645 | case 'x': |
| 1646 | case 'X': |
| 1647 | case 'I': |
| 1648 | case 'E': |
| 1649 | return (scm_read_number_and_radix (chr, port, opts)); |
| 1650 | case '{': |
| 1651 | return (scm_read_extended_symbol (chr, port)); |
| 1652 | case '!': |
| 1653 | return (scm_read_shebang (chr, port, opts)); |
| 1654 | case ';': |
| 1655 | return (scm_read_commented_expression (chr, port, opts)); |
| 1656 | case '`': |
| 1657 | case '\'': |
| 1658 | case ',': |
| 1659 | return (scm_read_syntax (chr, port, opts)); |
| 1660 | case 'n': |
| 1661 | return (scm_read_nil (chr, port, opts)); |
| 1662 | default: |
| 1663 | result = scm_read_sharp_extension (chr, port, opts); |
| 1664 | if (scm_is_eq (result, SCM_UNSPECIFIED)) |
| 1665 | { |
| 1666 | /* To remain compatible with 1.8 and earlier, the following |
| 1667 | characters have lower precedence than `read-hash-extend' |
| 1668 | characters. */ |
| 1669 | switch (chr) |
| 1670 | { |
| 1671 | case '|': |
| 1672 | return scm_read_r6rs_block_comment (chr, port); |
| 1673 | default: |
| 1674 | scm_i_input_error (FUNC_NAME, port, "Unknown # object: ~S", |
| 1675 | scm_list_1 (SCM_MAKE_CHAR (chr))); |
| 1676 | } |
| 1677 | } |
| 1678 | else |
| 1679 | return result; |
| 1680 | } |
| 1681 | |
| 1682 | return SCM_UNSPECIFIED; |
| 1683 | } |
| 1684 | #undef FUNC_NAME |
| 1685 | |
| 1686 | static SCM |
| 1687 | read_inner_expression (SCM port, scm_t_read_opts *opts) |
| 1688 | #define FUNC_NAME "read_inner_expression" |
| 1689 | { |
| 1690 | while (1) |
| 1691 | { |
| 1692 | scm_t_wchar chr; |
| 1693 | |
| 1694 | chr = scm_getc (port); |
| 1695 | |
| 1696 | switch (chr) |
| 1697 | { |
| 1698 | case SCM_WHITE_SPACES: |
| 1699 | case SCM_LINE_INCREMENTORS: |
| 1700 | break; |
| 1701 | case ';': |
| 1702 | (void) scm_read_semicolon_comment (chr, port); |
| 1703 | break; |
| 1704 | case '{': |
| 1705 | if (opts->curly_infix_p) |
| 1706 | { |
| 1707 | if (opts->neoteric_p) |
| 1708 | return scm_read_sexp (chr, port, opts); |
| 1709 | else |
| 1710 | { |
| 1711 | SCM expr; |
| 1712 | |
| 1713 | /* Enable neoteric expressions within curly braces */ |
| 1714 | opts->neoteric_p = 1; |
| 1715 | expr = scm_read_sexp (chr, port, opts); |
| 1716 | opts->neoteric_p = 0; |
| 1717 | return expr; |
| 1718 | } |
| 1719 | } |
| 1720 | else |
| 1721 | return scm_read_mixed_case_symbol (chr, port, opts); |
| 1722 | case '[': |
| 1723 | if (opts->square_brackets_p) |
| 1724 | return scm_read_sexp (chr, port, opts); |
| 1725 | else if (opts->curly_infix_p) |
| 1726 | { |
| 1727 | /* The syntax of neoteric expressions requires that '[' be |
| 1728 | a delimiter when curly-infix is enabled, so it cannot |
| 1729 | be part of an unescaped symbol. We might as well do |
| 1730 | something useful with it, so we adopt Kawa's convention: |
| 1731 | [...] => ($bracket-list$ ...) */ |
| 1732 | long line = SCM_LINUM (port); |
| 1733 | int column = SCM_COL (port) - 1; |
| 1734 | return maybe_annotate_source |
| 1735 | (scm_cons (sym_bracket_list, scm_read_sexp (chr, port, opts)), |
| 1736 | port, opts, line, column); |
| 1737 | } |
| 1738 | else |
| 1739 | return scm_read_mixed_case_symbol (chr, port, opts); |
| 1740 | case '(': |
| 1741 | return (scm_read_sexp (chr, port, opts)); |
| 1742 | case '"': |
| 1743 | return (scm_read_string (chr, port, opts)); |
| 1744 | case '\'': |
| 1745 | case '`': |
| 1746 | case ',': |
| 1747 | return (scm_read_quote (chr, port, opts)); |
| 1748 | case '#': |
| 1749 | { |
| 1750 | long line = SCM_LINUM (port); |
| 1751 | int column = SCM_COL (port) - 1; |
| 1752 | SCM result = scm_read_sharp (chr, port, opts, line, column); |
| 1753 | if (scm_is_eq (result, SCM_UNSPECIFIED)) |
| 1754 | /* We read a comment or some such. */ |
| 1755 | break; |
| 1756 | else |
| 1757 | return result; |
| 1758 | } |
| 1759 | case ')': |
| 1760 | scm_i_input_error (FUNC_NAME, port, "unexpected \")\"", SCM_EOL); |
| 1761 | break; |
| 1762 | case '}': |
| 1763 | if (opts->curly_infix_p) |
| 1764 | scm_i_input_error (FUNC_NAME, port, "unexpected \"}\"", SCM_EOL); |
| 1765 | else |
| 1766 | return scm_read_mixed_case_symbol (chr, port, opts); |
| 1767 | case ']': |
| 1768 | if (opts->square_brackets_p) |
| 1769 | scm_i_input_error (FUNC_NAME, port, "unexpected \"]\"", SCM_EOL); |
| 1770 | /* otherwise fall through */ |
| 1771 | case EOF: |
| 1772 | return SCM_EOF_VAL; |
| 1773 | case ':': |
| 1774 | if (opts->keyword_style == KEYWORD_STYLE_PREFIX) |
| 1775 | return scm_symbol_to_keyword (scm_read_expression (port, opts)); |
| 1776 | /* Fall through. */ |
| 1777 | |
| 1778 | default: |
| 1779 | { |
| 1780 | if (((chr >= '0') && (chr <= '9')) |
| 1781 | || (strchr ("+-.", chr))) |
| 1782 | return (scm_read_number (chr, port, opts)); |
| 1783 | else |
| 1784 | return (scm_read_mixed_case_symbol (chr, port, opts)); |
| 1785 | } |
| 1786 | } |
| 1787 | } |
| 1788 | } |
| 1789 | #undef FUNC_NAME |
| 1790 | |
| 1791 | static SCM |
| 1792 | scm_read_expression (SCM port, scm_t_read_opts *opts) |
| 1793 | #define FUNC_NAME "scm_read_expression" |
| 1794 | { |
| 1795 | if (!opts->neoteric_p) |
| 1796 | return read_inner_expression (port, opts); |
| 1797 | else |
| 1798 | { |
| 1799 | long line = 0; |
| 1800 | int column = 0; |
| 1801 | SCM expr; |
| 1802 | |
| 1803 | if (opts->record_positions_p) |
| 1804 | { |
| 1805 | /* We need to get the position of the first non-whitespace |
| 1806 | character in order to correctly annotate neoteric |
| 1807 | expressions. For example, for the expression 'f(x)', the |
| 1808 | first call to 'read_inner_expression' reads the 'f' (which |
| 1809 | cannot be annotated), and then we later read the '(x)' and |
| 1810 | use it to construct the new list (f x). */ |
| 1811 | int c = flush_ws (port, opts, (char *) NULL); |
| 1812 | if (c == EOF) |
| 1813 | return SCM_EOF_VAL; |
| 1814 | scm_ungetc (c, port); |
| 1815 | line = SCM_LINUM (port); |
| 1816 | column = SCM_COL (port); |
| 1817 | } |
| 1818 | |
| 1819 | expr = read_inner_expression (port, opts); |
| 1820 | |
| 1821 | /* 'expr' is the first component of the neoteric expression. Now |
| 1822 | we loop, and as long as the next character is '(', '[', or '{', |
| 1823 | (without any intervening whitespace), we use it to construct a |
| 1824 | new expression. For example, f{n - 1}(x) => ((f (- n 1)) x). */ |
| 1825 | for (;;) |
| 1826 | { |
| 1827 | int chr = scm_getc (port); |
| 1828 | |
| 1829 | if (chr == '(') |
| 1830 | /* e(...) => (e ...) */ |
| 1831 | expr = scm_cons (expr, scm_read_sexp (chr, port, opts)); |
| 1832 | else if (chr == '[') |
| 1833 | /* e[...] => ($bracket-apply$ e ...) */ |
| 1834 | expr = scm_cons (sym_bracket_apply, |
| 1835 | scm_cons (expr, |
| 1836 | scm_read_sexp (chr, port, opts))); |
| 1837 | else if (chr == '{') |
| 1838 | { |
| 1839 | SCM arg = scm_read_sexp (chr, port, opts); |
| 1840 | |
| 1841 | if (scm_is_null (arg)) |
| 1842 | expr = scm_list_1 (expr); /* e{} => (e) */ |
| 1843 | else |
| 1844 | expr = scm_list_2 (expr, arg); /* e{...} => (e {...}) */ |
| 1845 | } |
| 1846 | else |
| 1847 | { |
| 1848 | if (chr != EOF) |
| 1849 | scm_ungetc (chr, port); |
| 1850 | break; |
| 1851 | } |
| 1852 | maybe_annotate_source (expr, port, opts, line, column); |
| 1853 | } |
| 1854 | return expr; |
| 1855 | } |
| 1856 | } |
| 1857 | #undef FUNC_NAME |
| 1858 | |
| 1859 | \f |
| 1860 | /* Actual reader. */ |
| 1861 | |
| 1862 | static void init_read_options (SCM port, scm_t_read_opts *opts); |
| 1863 | |
| 1864 | SCM_DEFINE (scm_read, "read", 0, 1, 0, |
| 1865 | (SCM port), |
| 1866 | "Read an s-expression from the input port @var{port}, or from\n" |
| 1867 | "the current input port if @var{port} is not specified.\n" |
| 1868 | "Any whitespace before the next token is discarded.") |
| 1869 | #define FUNC_NAME s_scm_read |
| 1870 | { |
| 1871 | scm_t_read_opts opts; |
| 1872 | int c; |
| 1873 | |
| 1874 | if (SCM_UNBNDP (port)) |
| 1875 | port = scm_current_input_port (); |
| 1876 | SCM_VALIDATE_OPINPORT (1, port); |
| 1877 | |
| 1878 | init_read_options (port, &opts); |
| 1879 | |
| 1880 | c = flush_ws (port, &opts, (char *) NULL); |
| 1881 | if (EOF == c) |
| 1882 | return SCM_EOF_VAL; |
| 1883 | scm_ungetc (c, port); |
| 1884 | |
| 1885 | return (scm_read_expression (port, &opts)); |
| 1886 | } |
| 1887 | #undef FUNC_NAME |
| 1888 | |
| 1889 | |
| 1890 | \f |
| 1891 | |
| 1892 | /* Manipulate the read-hash-procedures alist. This could be written in |
| 1893 | Scheme, but maybe it will also be used by C code during initialisation. */ |
| 1894 | SCM_DEFINE (scm_read_hash_extend, "read-hash-extend", 2, 0, 0, |
| 1895 | (SCM chr, SCM proc), |
| 1896 | "Install the procedure @var{proc} for reading expressions\n" |
| 1897 | "starting with the character sequence @code{#} and @var{chr}.\n" |
| 1898 | "@var{proc} will be called with two arguments: the character\n" |
| 1899 | "@var{chr} and the port to read further data from. The object\n" |
| 1900 | "returned will be the return value of @code{read}. \n" |
| 1901 | "Passing @code{#f} for @var{proc} will remove a previous setting. \n" |
| 1902 | ) |
| 1903 | #define FUNC_NAME s_scm_read_hash_extend |
| 1904 | { |
| 1905 | SCM this; |
| 1906 | SCM prev; |
| 1907 | |
| 1908 | SCM_VALIDATE_CHAR (1, chr); |
| 1909 | SCM_ASSERT (scm_is_false (proc) |
| 1910 | || scm_is_eq (scm_procedure_p (proc), SCM_BOOL_T), |
| 1911 | proc, SCM_ARG2, FUNC_NAME); |
| 1912 | |
| 1913 | /* Check if chr is already in the alist. */ |
| 1914 | this = scm_i_read_hash_procedures_ref (); |
| 1915 | prev = SCM_BOOL_F; |
| 1916 | while (1) |
| 1917 | { |
| 1918 | if (scm_is_null (this)) |
| 1919 | { |
| 1920 | /* not found, so add it to the beginning. */ |
| 1921 | if (scm_is_true (proc)) |
| 1922 | { |
| 1923 | SCM new = scm_cons (scm_cons (chr, proc), |
| 1924 | scm_i_read_hash_procedures_ref ()); |
| 1925 | scm_i_read_hash_procedures_set_x (new); |
| 1926 | } |
| 1927 | break; |
| 1928 | } |
| 1929 | if (scm_is_eq (chr, SCM_CAAR (this))) |
| 1930 | { |
| 1931 | /* already in the alist. */ |
| 1932 | if (scm_is_false (proc)) |
| 1933 | { |
| 1934 | /* remove it. */ |
| 1935 | if (scm_is_false (prev)) |
| 1936 | { |
| 1937 | SCM rest = SCM_CDR (scm_i_read_hash_procedures_ref ()); |
| 1938 | scm_i_read_hash_procedures_set_x (rest); |
| 1939 | } |
| 1940 | else |
| 1941 | scm_set_cdr_x (prev, SCM_CDR (this)); |
| 1942 | } |
| 1943 | else |
| 1944 | { |
| 1945 | /* replace it. */ |
| 1946 | scm_set_cdr_x (SCM_CAR (this), proc); |
| 1947 | } |
| 1948 | break; |
| 1949 | } |
| 1950 | prev = this; |
| 1951 | this = SCM_CDR (this); |
| 1952 | } |
| 1953 | |
| 1954 | return SCM_UNSPECIFIED; |
| 1955 | } |
| 1956 | #undef FUNC_NAME |
| 1957 | |
| 1958 | /* Recover the read-hash procedure corresponding to char c. */ |
| 1959 | static SCM |
| 1960 | scm_get_hash_procedure (int c) |
| 1961 | { |
| 1962 | SCM rest = scm_i_read_hash_procedures_ref (); |
| 1963 | |
| 1964 | while (1) |
| 1965 | { |
| 1966 | if (scm_is_null (rest)) |
| 1967 | return SCM_BOOL_F; |
| 1968 | |
| 1969 | if (SCM_CHAR (SCM_CAAR (rest)) == c) |
| 1970 | return SCM_CDAR (rest); |
| 1971 | |
| 1972 | rest = SCM_CDR (rest); |
| 1973 | } |
| 1974 | } |
| 1975 | |
| 1976 | #define SCM_ENCODING_SEARCH_SIZE (500) |
| 1977 | |
| 1978 | /* Search the first few hundred characters of a file for an Emacs-like coding |
| 1979 | declaration. Returns either NULL or a string whose storage has been |
| 1980 | allocated with `scm_gc_malloc ()'. */ |
| 1981 | char * |
| 1982 | scm_i_scan_for_encoding (SCM port) |
| 1983 | { |
| 1984 | scm_t_port *pt; |
| 1985 | char header[SCM_ENCODING_SEARCH_SIZE+1]; |
| 1986 | size_t bytes_read, encoding_length, i; |
| 1987 | char *encoding = NULL; |
| 1988 | int utf8_bom = 0; |
| 1989 | char *pos, *encoding_start; |
| 1990 | int in_comment; |
| 1991 | |
| 1992 | pt = SCM_PTAB_ENTRY (port); |
| 1993 | |
| 1994 | if (pt->rw_active == SCM_PORT_WRITE) |
| 1995 | scm_flush (port); |
| 1996 | |
| 1997 | if (pt->rw_random) |
| 1998 | pt->rw_active = SCM_PORT_READ; |
| 1999 | |
| 2000 | if (pt->read_pos == pt->read_end) |
| 2001 | { |
| 2002 | /* We can use the read buffer, and thus avoid a seek. */ |
| 2003 | if (scm_fill_input (port) == EOF) |
| 2004 | return NULL; |
| 2005 | |
| 2006 | bytes_read = pt->read_end - pt->read_pos; |
| 2007 | if (bytes_read > SCM_ENCODING_SEARCH_SIZE) |
| 2008 | bytes_read = SCM_ENCODING_SEARCH_SIZE; |
| 2009 | |
| 2010 | if (bytes_read <= 1) |
| 2011 | /* An unbuffered port -- don't scan. */ |
| 2012 | return NULL; |
| 2013 | |
| 2014 | memcpy (header, pt->read_pos, bytes_read); |
| 2015 | header[bytes_read] = '\0'; |
| 2016 | } |
| 2017 | else |
| 2018 | { |
| 2019 | /* Try to read some bytes and then seek back. Not all ports |
| 2020 | support seeking back; and indeed some file ports (like |
| 2021 | /dev/urandom) will succeed on an lseek (fd, 0, SEEK_CUR)---the |
| 2022 | check performed by SCM_FPORT_FDES---but fail to seek |
| 2023 | backwards. Hence this block comes second. We prefer to use |
| 2024 | the read buffer in-place. */ |
| 2025 | if (SCM_FPORTP (port) && !SCM_FDES_RANDOM_P (SCM_FPORT_FDES (port))) |
| 2026 | return NULL; |
| 2027 | |
| 2028 | bytes_read = scm_c_read (port, header, SCM_ENCODING_SEARCH_SIZE); |
| 2029 | header[bytes_read] = '\0'; |
| 2030 | scm_seek (port, scm_from_int (0), scm_from_int (SEEK_SET)); |
| 2031 | } |
| 2032 | |
| 2033 | if (bytes_read > 3 |
| 2034 | && header[0] == '\xef' && header[1] == '\xbb' && header[2] == '\xbf') |
| 2035 | utf8_bom = 1; |
| 2036 | |
| 2037 | /* search past "coding[:=]" */ |
| 2038 | pos = header; |
| 2039 | while (1) |
| 2040 | { |
| 2041 | if ((pos = strstr(pos, "coding")) == NULL) |
| 2042 | return NULL; |
| 2043 | |
| 2044 | pos += strlen("coding"); |
| 2045 | if (pos - header >= SCM_ENCODING_SEARCH_SIZE || |
| 2046 | (*pos == ':' || *pos == '=')) |
| 2047 | { |
| 2048 | pos ++; |
| 2049 | break; |
| 2050 | } |
| 2051 | } |
| 2052 | |
| 2053 | /* skip spaces */ |
| 2054 | while (pos - header <= SCM_ENCODING_SEARCH_SIZE && |
| 2055 | (*pos == ' ' || *pos == '\t')) |
| 2056 | pos ++; |
| 2057 | |
| 2058 | /* grab the next token */ |
| 2059 | encoding_start = pos; |
| 2060 | i = 0; |
| 2061 | while (encoding_start + i - header <= SCM_ENCODING_SEARCH_SIZE |
| 2062 | && encoding_start + i - header < bytes_read |
| 2063 | && (isalnum ((int) encoding_start[i]) |
| 2064 | || strchr ("_-.:/,+=()", encoding_start[i]) != NULL)) |
| 2065 | i++; |
| 2066 | |
| 2067 | encoding_length = i; |
| 2068 | if (encoding_length == 0) |
| 2069 | return NULL; |
| 2070 | |
| 2071 | encoding = scm_gc_strndup (encoding_start, encoding_length, "encoding"); |
| 2072 | for (i = 0; i < encoding_length; i++) |
| 2073 | encoding[i] = toupper ((int) encoding[i]); |
| 2074 | |
| 2075 | /* push backwards to make sure we were in a comment */ |
| 2076 | in_comment = 0; |
| 2077 | pos = encoding_start; |
| 2078 | while (pos >= header) |
| 2079 | { |
| 2080 | if (*pos == ';') |
| 2081 | { |
| 2082 | in_comment = 1; |
| 2083 | break; |
| 2084 | } |
| 2085 | else if (*pos == '\n' || pos == header) |
| 2086 | { |
| 2087 | /* This wasn't in a semicolon comment. Check for a |
| 2088 | hash-bang comment. */ |
| 2089 | char *beg = strstr (header, "#!"); |
| 2090 | char *end = strstr (header, "!#"); |
| 2091 | if (beg < encoding_start && encoding_start + encoding_length <= end) |
| 2092 | in_comment = 1; |
| 2093 | break; |
| 2094 | } |
| 2095 | else |
| 2096 | { |
| 2097 | pos --; |
| 2098 | continue; |
| 2099 | } |
| 2100 | } |
| 2101 | if (!in_comment) |
| 2102 | /* This wasn't in a comment */ |
| 2103 | return NULL; |
| 2104 | |
| 2105 | if (utf8_bom && strcasecmp(encoding, "UTF-8")) |
| 2106 | scm_misc_error (NULL, |
| 2107 | "the port input declares the encoding ~s but is encoded as UTF-8", |
| 2108 | scm_list_1 (scm_from_locale_string (encoding))); |
| 2109 | |
| 2110 | return encoding; |
| 2111 | } |
| 2112 | |
| 2113 | SCM_DEFINE (scm_file_encoding, "file-encoding", 1, 0, 0, |
| 2114 | (SCM port), |
| 2115 | "Scans the port for an Emacs-like character coding declaration\n" |
| 2116 | "near the top of the contents of a port with random-accessible contents.\n" |
| 2117 | "The coding declaration is of the form\n" |
| 2118 | "@code{coding: XXXXX} and must appear in a scheme comment.\n" |
| 2119 | "\n" |
| 2120 | "Returns a string containing the character encoding of the file\n" |
| 2121 | "if a declaration was found, or @code{#f} otherwise.\n") |
| 2122 | #define FUNC_NAME s_scm_file_encoding |
| 2123 | { |
| 2124 | char *enc; |
| 2125 | SCM s_enc; |
| 2126 | |
| 2127 | SCM_VALIDATE_OPINPORT (SCM_ARG1, port); |
| 2128 | |
| 2129 | enc = scm_i_scan_for_encoding (port); |
| 2130 | if (enc == NULL) |
| 2131 | return SCM_BOOL_F; |
| 2132 | else |
| 2133 | { |
| 2134 | s_enc = scm_from_locale_string (enc); |
| 2135 | return s_enc; |
| 2136 | } |
| 2137 | |
| 2138 | return SCM_BOOL_F; |
| 2139 | } |
| 2140 | #undef FUNC_NAME |
| 2141 | |
| 2142 | \f |
| 2143 | /* Per-port read options. |
| 2144 | |
| 2145 | We store per-port read options in the 'port-read-options' key of the |
| 2146 | port's alist, which is stored in the internal port structure. The |
| 2147 | value stored in the alist is a single integer that contains a two-bit |
| 2148 | field for each read option. |
| 2149 | |
| 2150 | If a bit field contains READ_OPTION_INHERIT (3), that indicates that |
| 2151 | the applicable value should be inherited from the corresponding |
| 2152 | global read option. Otherwise, the bit field contains the value of |
| 2153 | the read option. For boolean read options that have been set |
| 2154 | per-port, the possible values are 0 or 1. If the 'keyword_style' |
| 2155 | read option has been set per-port, its possible values are those in |
| 2156 | 'enum t_keyword_style'. */ |
| 2157 | |
| 2158 | /* Key to read options in per-port alists. */ |
| 2159 | SCM_SYMBOL (sym_port_read_options, "port-read-options"); |
| 2160 | |
| 2161 | /* Offsets of bit fields for each per-port override */ |
| 2162 | #define READ_OPTION_COPY_SOURCE_P 0 |
| 2163 | #define READ_OPTION_RECORD_POSITIONS_P 2 |
| 2164 | #define READ_OPTION_CASE_INSENSITIVE_P 4 |
| 2165 | #define READ_OPTION_KEYWORD_STYLE 6 |
| 2166 | #define READ_OPTION_R6RS_ESCAPES_P 8 |
| 2167 | #define READ_OPTION_SQUARE_BRACKETS_P 10 |
| 2168 | #define READ_OPTION_HUNGRY_EOL_ESCAPES_P 12 |
| 2169 | #define READ_OPTION_CURLY_INFIX_P 14 |
| 2170 | |
| 2171 | /* The total width in bits of the per-port overrides */ |
| 2172 | #define READ_OPTIONS_NUM_BITS 16 |
| 2173 | |
| 2174 | #define READ_OPTIONS_INHERIT_ALL ((1UL << READ_OPTIONS_NUM_BITS) - 1) |
| 2175 | #define READ_OPTIONS_MAX_VALUE READ_OPTIONS_INHERIT_ALL |
| 2176 | |
| 2177 | #define READ_OPTION_MASK 3 |
| 2178 | #define READ_OPTION_INHERIT 3 |
| 2179 | |
| 2180 | static void |
| 2181 | set_port_read_option (SCM port, int option, int new_value) |
| 2182 | { |
| 2183 | SCM alist, scm_read_options; |
| 2184 | unsigned int read_options; |
| 2185 | |
| 2186 | new_value &= READ_OPTION_MASK; |
| 2187 | alist = scm_i_port_alist (port); |
| 2188 | scm_read_options = scm_assq_ref (alist, sym_port_read_options); |
| 2189 | if (scm_is_unsigned_integer (scm_read_options, 0, READ_OPTIONS_MAX_VALUE)) |
| 2190 | read_options = scm_to_uint (scm_read_options); |
| 2191 | else |
| 2192 | read_options = READ_OPTIONS_INHERIT_ALL; |
| 2193 | read_options &= ~(READ_OPTION_MASK << option); |
| 2194 | read_options |= new_value << option; |
| 2195 | scm_read_options = scm_from_uint (read_options); |
| 2196 | alist = scm_assq_set_x (alist, sym_port_read_options, scm_read_options); |
| 2197 | scm_i_set_port_alist_x (port, alist); |
| 2198 | } |
| 2199 | |
| 2200 | /* Set OPTS and PORT's case-insensitivity according to VALUE. */ |
| 2201 | static void |
| 2202 | set_port_case_insensitive_p (SCM port, scm_t_read_opts *opts, int value) |
| 2203 | { |
| 2204 | value = !!value; |
| 2205 | opts->case_insensitive_p = value; |
| 2206 | set_port_read_option (port, READ_OPTION_CASE_INSENSITIVE_P, value); |
| 2207 | } |
| 2208 | |
| 2209 | /* Set OPTS and PORT's square_brackets_p option according to VALUE. */ |
| 2210 | static void |
| 2211 | set_port_square_brackets_p (SCM port, scm_t_read_opts *opts, int value) |
| 2212 | { |
| 2213 | value = !!value; |
| 2214 | opts->square_brackets_p = value; |
| 2215 | set_port_read_option (port, READ_OPTION_SQUARE_BRACKETS_P, value); |
| 2216 | } |
| 2217 | |
| 2218 | /* Set OPTS and PORT's curly_infix_p option according to VALUE. */ |
| 2219 | static void |
| 2220 | set_port_curly_infix_p (SCM port, scm_t_read_opts *opts, int value) |
| 2221 | { |
| 2222 | value = !!value; |
| 2223 | opts->curly_infix_p = value; |
| 2224 | set_port_read_option (port, READ_OPTION_CURLY_INFIX_P, value); |
| 2225 | } |
| 2226 | |
| 2227 | /* Initialize OPTS based on PORT's read options and the global read |
| 2228 | options. */ |
| 2229 | static void |
| 2230 | init_read_options (SCM port, scm_t_read_opts *opts) |
| 2231 | { |
| 2232 | SCM alist, val, scm_read_options; |
| 2233 | unsigned int read_options, x; |
| 2234 | |
| 2235 | alist = scm_i_port_alist (port); |
| 2236 | scm_read_options = scm_assq_ref (alist, sym_port_read_options); |
| 2237 | |
| 2238 | if (scm_is_unsigned_integer (scm_read_options, 0, READ_OPTIONS_MAX_VALUE)) |
| 2239 | read_options = scm_to_uint (scm_read_options); |
| 2240 | else |
| 2241 | read_options = READ_OPTIONS_INHERIT_ALL; |
| 2242 | |
| 2243 | x = READ_OPTION_MASK & (read_options >> READ_OPTION_KEYWORD_STYLE); |
| 2244 | if (x == READ_OPTION_INHERIT) |
| 2245 | { |
| 2246 | val = SCM_PACK (SCM_KEYWORD_STYLE); |
| 2247 | if (scm_is_eq (val, scm_keyword_prefix)) |
| 2248 | x = KEYWORD_STYLE_PREFIX; |
| 2249 | else if (scm_is_eq (val, scm_keyword_postfix)) |
| 2250 | x = KEYWORD_STYLE_POSTFIX; |
| 2251 | else |
| 2252 | x = KEYWORD_STYLE_HASH_PREFIX; |
| 2253 | } |
| 2254 | opts->keyword_style = x; |
| 2255 | |
| 2256 | #define RESOLVE_BOOLEAN_OPTION(NAME, name) \ |
| 2257 | do \ |
| 2258 | { \ |
| 2259 | x = READ_OPTION_MASK & (read_options >> READ_OPTION_ ## NAME); \ |
| 2260 | if (x == READ_OPTION_INHERIT) \ |
| 2261 | x = !!SCM_ ## NAME; \ |
| 2262 | opts->name = x; \ |
| 2263 | } \ |
| 2264 | while (0) |
| 2265 | |
| 2266 | RESOLVE_BOOLEAN_OPTION (COPY_SOURCE_P, copy_source_p); |
| 2267 | RESOLVE_BOOLEAN_OPTION (RECORD_POSITIONS_P, record_positions_p); |
| 2268 | RESOLVE_BOOLEAN_OPTION (CASE_INSENSITIVE_P, case_insensitive_p); |
| 2269 | RESOLVE_BOOLEAN_OPTION (R6RS_ESCAPES_P, r6rs_escapes_p); |
| 2270 | RESOLVE_BOOLEAN_OPTION (SQUARE_BRACKETS_P, square_brackets_p); |
| 2271 | RESOLVE_BOOLEAN_OPTION (HUNGRY_EOL_ESCAPES_P, hungry_eol_escapes_p); |
| 2272 | RESOLVE_BOOLEAN_OPTION (CURLY_INFIX_P, curly_infix_p); |
| 2273 | |
| 2274 | #undef RESOLVE_BOOLEAN_OPTION |
| 2275 | |
| 2276 | opts->neoteric_p = 0; |
| 2277 | } |
| 2278 | |
| 2279 | void |
| 2280 | scm_init_read () |
| 2281 | { |
| 2282 | SCM read_hash_procs; |
| 2283 | |
| 2284 | read_hash_procs = scm_make_fluid_with_default (SCM_EOL); |
| 2285 | |
| 2286 | scm_i_read_hash_procedures = |
| 2287 | SCM_VARIABLE_LOC (scm_c_define ("%read-hash-procedures", read_hash_procs)); |
| 2288 | |
| 2289 | scm_init_opts (scm_read_options, scm_read_opts); |
| 2290 | #include "libguile/read.x" |
| 2291 | } |
| 2292 | |
| 2293 | /* |
| 2294 | Local Variables: |
| 2295 | c-file-style: "gnu" |
| 2296 | End: |
| 2297 | */ |